Honestly considering waiting to see if a carrier provides the Mate 20 X on plan then, as Mate 20 Pro is more expensive than I anticipated and I don't really care about a wireless charging pad or some old FreeBuds.

Okay I managed to verify via Optus chat that you 100% will get the FreeBuds and wireless charger via redemption:

Arthur R (17:47:31 AEST) : We have Huawei Mate20 Pro XXX GB, The plan cost you $85 for the plan that in includes $85 for the plan + $0 for the phone. In which you get XXX GB data . The total contract you will be paying $XXX Over 24 months.Visitor (17:48:45 AEST) : Yes I know that. So you are XXX% certain if I pre-order a Mate 20 Pro from Optus I will be eligible to get a free wireless charger and wireless earphones via redemption?Auto-Generated Message (17:50:46 AEST) : Sorry to keep you waiting, I'll be right back with you.Arthur R (17:52:11 AEST) : Yes .Arthur R (17:52:36 AEST) : claim FreeBuds and Wireless charger on https://www.huaweipromotions.com.auArthur R (17:53:08 AEST) : You will have to log in and sign up so you will get the claim FreeBuds and Wireless charger.

I also verified that neither Optus or Vodafone will be selling the Mate 20 X at this stage. Looks like I'll be getting the Mate 20 Pro.